binder: fix race between mmput() and do_exit()
In the Linux kernel, the following vulnerability has been resolved: binder: fix race between mmput() and do_exit() Task A calls binder_update_page_range() to allocate and insert pages on a remote address space from Task B. For this, Task A pins the remote mm via mmget_not_zero() first. This can race with Task B do_exit() and the final mmput() refcount decrement will come from Task A. Task A | Task B ------------------+------------------ mmget_not_zero() | | do_exit() | exit_mm() | mmput() mmput() | exit_mmap() | remove_vma() | fput() | In this case, the work of ____fput() from Task B is queued up in Task A as TWA_RESUME. So in theory, Task A returns to userspace and the cleanup work gets executed. However, Task A instead sleep, waiting for a reply from Task B that never comes (it's dead). This means the binder_deferred_release() is blocked until an unrelated binder event forces Task A to go back to userspace. All the associated death notifications will also be delayed until then. In order to fix this use mmput_async() that will schedule the work in the corresponding mm->async_put_work WQ instead of Task A.
- Published
- Mar 18, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 7th percentile
- CWE
- CWE-362
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Report tools
Action score
18
Monitor
Low priority for now.
- CVSS
- 18 / 40 · 4.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- linux linux kernel4.20 and later · before 5.4.268
- linux linux kernel5.5 and later · before 5.10.209
- linux linux kernel5.11 and later · before 5.15.148
- linux linux kernel2.6.29 and later · before 4.19.306
- linux linux kernel6.2 and later · before 6.6.14
- linux linux kernel6.7 and later · before 6.7.2
- linux linux kernel5.16 and later · before 6.1.75
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.29affected
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 95b1d336b0642198b56836b89908d07b9a0c9608affected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 252a2a5569eb9f8d16428872cc24dea1ac0bb097affected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 7e7a0d86542b0ea903006d3f42f33c4f7ead6918affected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 98fee5bee97ad47b527a997d5786410430d1f0e9affected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 6696f76c32ff67fec26823fc2df46498e70d9bf3affected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3eaffected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 77d210e8db4d61d43b2d16df66b1ec46fad2ee01affected · git
- 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 and later · before 9a9ab0d963621d9d12199df9817e66982582d5a5affected · git
- before 2.6.29not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.76-1 | 6.1.76-1 |
| Debian:13 | linux | before 6.6.15-1 | 6.6.15-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 252a2a5569eb9f8d16428872cc24dea1ac0bb097 | Vendor (CNA) |
| Linux Linux | 6696f76c32ff67fec26823fc2df46498e70d9bf3 | Vendor (CNA) |
| Linux Linux | 67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e | Vendor (CNA) |
| Linux Linux | 77d210e8db4d61d43b2d16df66b1ec46fad2ee01 | Vendor (CNA) |
| Linux Linux | 7e7a0d86542b0ea903006d3f42f33c4f7ead6918 | Vendor (CNA) |
| Linux Linux | 95b1d336b0642198b56836b89908d07b9a0c9608 | Vendor (CNA) |
| Linux Linux | 98fee5bee97ad47b527a997d5786410430d1f0e9 | Vendor (CNA) |
| Linux Linux | 9a9ab0d963621d9d12199df9817e66982582d5a5 | Vendor (CNA) |
| debian:linux | 6.1.76-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918
- git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097
- git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3
- git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e
- git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01
- git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608
- git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9
- git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5
- lists.debian.org/debian-lts-announce/2024/06/msg00016.html
- lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.